3 ways to fix "Excel cannot open the file 'filename.xlsx' because …
https://excelrescue.net/blog/how-to-fix-excel-cannot-open-the-file-because-the-file-format-or-file-extension-is-not-valid
WEBJan 15, 2021 · Back to blog list. 3 ways to fix "Excel cannot open the file 'filename.xlsx' because the file format or file extension is not valid" error. Excel File Not Opening? – Here's What You Need to Know. Jan 15, 2021. Sometimes Excel files don't open properly or don't open at all, which can cause a lot of stress and panic.
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